hi I have a bf xr6 turbo with sieman injetor k/n inbox filter typhoon cold air intake 2 half exhaust cat back and flash tuned by cv.I have a nother cooler little bigger than the stock one will I have to retune it.

How much bigger?

In short - if you retune you will net a bigger gain however, if its not too much bigger and your not changing your Dump or Cat, then you dont really need a retune.

Run it on a dyno to make sure your AFR's havent changed and keep an eye on your boost gauge for any boost spikes.

Other than that, read other posts before askin the same quiestion that's been asked about 3000 times!

Other than that, read other posts before askin the same quiestion that's been asked about 3000 times!

thanks I will measure it tomorowand let you known the size.Talking about spiking some time it spikes with the stock cooler.It spikes from 15psi to 13psi